/*****************************************************************************
 *                                                                           *
 *  This file is part of the BeanShell Java Scripting distribution.          *
 *  Documentation and updates may be found at http://www.beanshell.org/      *
 *                                                                           *
 *  Sun Public License Notice:                                               *
 *                                                                           *
 *  The contents of this file are subject to the Sun Public License Version  *
 *  1.0 (the "License"); you may not use this file except in compliance with *
 *  the License. A copy of the License is available at http://www.sun.com    * 
 *                                                                           *
 *  The Original Code is BeanShell. The Initial Developer of the Original    *
 *  Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright     *
 *  (C) 2000.  All Rights Reserved.                                          *
 *                                                                           *
 *  GNU Public License Notice:                                               *
 *                                                                           *
 *  Alternatively, the contents of this file may be used under the terms of  *
 *  the GNU Lesser General Public License (the "LGPL"), in which case the    *
 *  provisions of LGPL are applicable instead of those above. If you wish to *
 *  allow use of your version of this file only under the  terms of the LGPL *
 *  and not to allow others to use your version of this file under the SPL,  *
 *  indicate your decision by deleting the provisions above and replace      *
 *  them with the notice and other provisions required by the LGPL.  If you  *
 *  do not delete the provisions above, a recipient may use your version of  *
 *  this file under either the SPL or the LGPL.                              *
 *                                                                           *
 *  Patrick Niemeyer (pat@pat.net)                                           *
 *  Author of Learning Java, O'Reilly & Associates                           *
 *  http://www.pat.net/~pat/                                                 *
 *                                                                           *
 *****************************************************************************/
package bsh;

import java.lang.reflect.InvocationTargetException;

/**
 * Method invocation covers syntax like:<br>
 * 
 * methodName(arguments)
 * 
 * <br>
 * It does not cover .method(arguments).  That is covered as a PrimaryPrefix.
 * 
 * 
 * @author Scott Stevenson
 */
class BSHMethodInvocation extends SimpleNode {

    BSHMethodInvocation(int id) {
        super(id);
    }

    BSHAmbiguousName getNameNode() {
        return (BSHAmbiguousName) jjtGetChild(0);
    }

    BSHArguments getArgsNode() {
        return (BSHArguments) jjtGetChild(1);
    }

    /**
    Evaluate the method invocation with the specified callstack and 
    interpreter
     */
    public Object eval(CallStack callstack, Interpreter interpreter)
            throws EvalError {
        NameSpace namespace = callstack.top();
        BSHAmbiguousName nameNode = getNameNode();

        // Do not evaluate methods this() or super() in class instance space
        // (i.e. inside a constructor)
        if (namespace.getParent() != null && namespace.getParent().isClass
                && (nameNode.text.equals("super") || nameNode.text.equals("this"))) {
            return Primitive.VOID;
        }

        Name name = nameNode.getName(namespace);
        Object[] args = getArgsNode().getArguments(callstack, interpreter);

// This try/catch block is replicated is BSHPrimarySuffix... need to
// factor out common functionality...
// Move to Reflect?
        try {
            return name.invokeMethod(interpreter, args, callstack, this);
        }
        catch (ReflectError e) {
            throw new EvalError(
                    "Error in method invocation: " + e.getMessage(),
                    this, callstack, e);
        }
        catch (InvocationTargetException e) {
            String msg = "Method Invocation " + name;
            Throwable te = e.getTargetException();

            /*
            Try to squeltch the native code stack trace if the exception
            was caused by a reflective call back into the bsh interpreter
            (e.g. eval() or source()
             */
            boolean isNative = true;
            if (te instanceof EvalError) {
                if (te instanceof TargetError) {
                    isNative = ((TargetError) te).inNativeCode();
                }
                else {
                    isNative = false;
                }
            }

            throw new TargetError(msg, te, this, callstack, isNative);
        }
        catch (UtilEvalError e) {
            throw e.toEvalError(this, callstack);
        }
    }
}
